#avr Logs

Sep 20 2020

07:52 AM Smidge204_ is now known as Smidge204
11:50 AM LeoNerd: Hrm.. So, turns out that ADCs often have nonlinearities around the zero point. It's best to calibrate them at two non-zero voltages, one small (but above the "small" limit), and one at the top end of the useful range
11:51 AM vmt: what kind of a magnitude are we talking about
11:53 AM LeoNerd: I haven't graphed it properly yet, but ballpark below about 0.1V
11:56 AM Rab: LeoNerd, zero for the ADC, or ground? I.e., same effect if the ADC is in differential mode?
11:58 AM LeoNerd: It's a differential ADC (ADS1115 in diff mode), though the negative input is basically at ground rail
11:58 AM Rab: ahh
11:15 PM day_ is now known as day